Não informado. (1917). The Plant Disease Bulletin. Department of Agriculture, Division of Mycology and Disease Survey.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. The Plant Disease Bulletin. Washington: Department of Agriculture, Division of Mycology and Disease Survey, 1917.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. The Plant Disease Bulletin. Department of Agriculture, Division of Mycology and Disease Survey, 1917.
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